MusclesMyocytes, CardiacMuscle, SmoothMuscle ProteinsMyocytes, Smooth MuscleMyocardiumMuscle, SkeletalHeartMuscle Fibers, SkeletalCells, CulturedMuscle CellsMuscle ContractionMuscle DevelopmentMuscle, Smooth, VascularCalciumCardiac OutputArrhythmias, CardiacMyocardial ContractionRats, Sprague-DawleyTime FactorsAortaHeart VentriclesMyoblasts, CardiacMuscle Fibers, Fast-TwitchMuscle DenervationMuscle FatigueMuscle Fibers, Slow-TwitchRNA, MessengerCardiomegalyMitochondria, MuscleMyofibrilsSignal TransductionRabbitsCardiac Surgical ProceduresRats, WistarDeath, Sudden, CardiacMembrane PotentialsMuscle RelaxationPapillary MusclesModels, CardiovascularAnimals, NewbornGuinea PigsMuscle, StriatedCell DifferentiationGene Expression RegulationNeck MusclesOculomotor MusclesSarcolemmaSarcomeresMuscle SpindlesHeart DiseasesAction PotentialsRespiratory MusclesDogsMuscle WeaknessElectric StimulationDose-Response Relationship, DrugCardiomyopathiesVentricular FunctionKineticsActinsDisease Models, AnimalCell LineElectrophysiologyPhosphorylationCardiac Pacing, ArtificialImmunohistochemistryMice, Inbred C57BLCell DivisionMyosin Heavy ChainsGene ExpressionQuadriceps MuscleAbdominal MusclesCalcium SignalingBlotting, WesternChick EmbryoMolecular Sequence DataModels, BiologicalMice, KnockoutAngiotensin IIEnzyme InhibitorsIsometric ContractionMice, TransgenicAorta, ThoracicMitochondria, HeartHeart FailureCardiac TamponadeMasseter MusclePotassiumMuscular AtrophyPlatelet-Derived Growth FactorFacial MusclesCell ProliferationMasticatory MusclesPotassium ChannelsIntercostal MusclesReverse Transcriptase Polymerase Chain ReactionElectromyographyCoronary VesselsHeart Conduction System